Move file_util::Delete to the base namespace

base/test/test_file_util_win.cc

Index: base/test/test_file_util_win.cc
diff --git a/base/test/test_file_util_win.cc b/base/test/test_file_util_win.cc
index 8e130d842107201f6f4e7f2bd239d0ae1013d83b..9e3697bebe27ecd70e37edbcf065ae505de0ecdc 100644
--- a/base/test/test_file_util_win.cc
+++ b/base/test/test_file_util_win.cc
@@ -126,7 +126,7 @@ bool DieFileDie(const base::FilePath& file, bool recurse) {
   // into short chunks, so that if a try succeeds, we won't delay the test
   // for too long.
   for (int i = 0; i < kIterations; ++i) {
-    if (file_util::Delete(file, recurse))
+    if (base::Delete(file, recurse))
       return true;
     base::PlatformThread::Sleep(kTimeout);
   }